improve readme

example/readme.md

@@ -1,23 +1,33 @@
 # Purescript Bridge example
 
-This project demonstrates the libraries Purescript Bridge and [`purescript-argonaut-aeson-generic`](https://pursuit.purescript.org/packages/purescript-argonaut-aeson-generic) ([GitHub](https://github.com/coot/purescript-argonaut-aeson-generic)).
+This project demonstrates the libraries Purescript Bridge and [`input-output-hk/purescript-bridge-json-helpers`](https://github.com/input-output-hk/purescript-bridge-json-helpers.git).
 
-It needs Purescript 0.15.
+It does not use [`purescript-argonaut-aeson-generic`](https://pursuit.purescript.org/packages/purescript-argonaut-aeson-generic) ([GitHub](https://github.com/coot/purescript-argonaut-aeson-generic)).
 
-The Haskell type `Foo`, in `src/Types.hs`, is generated for Purescript by Purescript Bridge.  Purescript Argonaut Aeson Generic is used to decode and encode this type, client-side.
+The Haskell type `Foo`, in `src/Types.hs`, is generated for Purescript by Purescript Bridge.  `purescript-bridge-json-helpers` is used to decode and encode this type, client-side.
 
-In this directory:
+# Dependencies
+## Nix
+The `nix develop` shell will provide Purescipt 0.15 and Spago.
+## Without Nix
+You must install Purescript 0.15 and Spago.
 
-- Generate the Javascript bundle:
+# Running the example
+- Enter the `example` directory
 
-```spago bundle-app --to static/index.js```
+- With Nix:
+```
+nix run
+```
 
-- `cabal run example`
+- Or without Nix:
+```
+cabal run example
+```
 
 - Open [http://localhost:8080/index.html](http://localhost:8080/index.html)
 
 - Open the browser's developer console and look for the message received:
-
 ```
 Foo message: Hello	 Foo number: 123    Foo list length: 11
 ```
@@ -28,10 +38,24 @@ Foo message: Hello	 Foo number: 123    Foo list length: 11
 Foo message: Hola        Foo number: 124        Foo list length: 22
 ```
 
-----------------
+# Updating the Purescript Bridge
+- Enter the `example` directory
+
+- Regenerate the Purescript Bridge types:
+```
+cabal run generate-purescript
+```
+
+- Generate the Javascript bundle:
+```
+spago bundle-app --to static/index.js
+```
+- or:
+```
+spago bundle-app --watch --to static/index.js
+```
 
-Regenerate the Purescript for the bridge type `Foo` with `cabal run generate-purescript`.
+- Restart the server
 
-----------------
 
-This Purescript Discourse thread assisted me: https://discourse.purescript.org/t/latest-and-greatest-haskell-purescript-serialization/1640
+More discussion: https://discourse.purescript.org/t/latest-and-greatest-haskell-purescript-serialization/1640